Process of manufacturing lead acetate.



No. 861,345. PATBNTED JULY 30, 1907. A. WULTZE. PROCESS OF MANUFACTURINGLEAD AGETATE.

APPLICATION FILED 00T.31, 1904.

ADOLF-WULTZE, OF CHARLOTTENBURG, GERMANY.

PROCESS OF MANUFACTURING LEAD ACETATE.

Specification of Letters Patent.

Patented July 30, 1907.

Application iiled October 31, 1904. Serial No. 230,768.

new and useful Process of Manufacturing Lead Acetate,

of which the following is an exact specification.

My invention relates to a new and useful process of manufacturinglead-acetate.

In the processes hitherto known lead acetate was obtained either bydissolving litharge in acetic acid and crystallizing the solution, orthe lead reduced to pieces was piled up, moistened by vinegar and thenleft to the action of air. The acetic lye obtained in this latter mannerwas then also crystallized.

A method of manufacturing lead acetate has become known, according towhich acetic acid vapors are brought into contact with metallic lead andin order to insure that the metallic lead offers always a brightsurfacel to the acetic acid vapors acting upon the lead for the purposeof forming lead acetate, lead liquor is sprinkled over the metallic leadfor Washing down the lead acetate.

The subject of my invention now is a process for obtaining lead acetatealso from metallic lead but by a continuous process under employment ofany quantity of air. The process consists therein, that loosely packedmetallic lead either granulated or in wire form is heaped up in a closedreceptacle and perfectly dipped into liquid acetic acid andsimultaneously air under pressure is introduced.

The process is as follows: A receptacle of about 8 cb'.m.

in which perforated partitions are arranged is fed with reduced piecesof lead or granulated lead.z The receptacle is then filled with dilutedacetic acid and then closed, so as to withstand the pressure exerted.The pressure air is then introduced by means of a pump exerting apressure of about 4 atmospheres. The whole reaction mass then heatsitself to about the warmth of a hand and the acetic acid reacts with theoxid of lead. After the reaction is finished, the salt is pressed out ofthe pressure receptacle and new acetic acid is introduced, and so on. Bythis process the manufacture of acetate of lead in large quantities isrealized: for example I bring in the receptacle at one time a charge of25000 kilograms of lead and 7000 liter of acetic acid, and 3800kilograms of acetate of lead are produced after the short time of 2hours and 40 minutes.

It is of course easy to obtain at will neutral or basic lead acetate..The apparatus employed is a monte-jus which is laid out with acid-proofmaterials.

In. order to make my invention more clear, I refer to the accompanyingdrawing, which shows a convenient form of an apparatus for practicing mynew process.

a is a receptacle, b are perforated plates arranged within the same,upon which the lead is loosely packed.

d is a cover, c is a rubber tube lor introducing the air, e is a furthertube for pressing out oi the receptacle the solution of salt, f is amanometer and g a valve for allowing the vinegar vapors mixed with airand pressed out of the receptacle by the excess of pressure, to enterthe tube e through which these vapors are led 0H to aplace, where theycan be used for other purposes.

The process for manufacturing acetate of 4lead in a closed apparatus hasthe advantage that the quantity of air necessary can be introduced atwill whereas in the methods hitherto used in which lead piled up wasexposed to the action of vinegar only that quantity of air contained inthe heaps of lead, was at disposal for the reaction. r.

My process has the further advantage that the solutions ol salt arisingcan be conveniently managed. 'lphe solutions of salts which are forinstance pressed out of the monte-jus can in my process at once be ledover to a further monte-jus and can be treated thereinwith carbonioacid, so as to give white lead. A further advantage consists thereinthat no acetic acid can be lost by evaporation.

Having thus fully described the nature of my invention, what I desire tosecure by Letters Patent of the United States is 1. Process formanufacturing lead-acetate consisting in feeding a vessel with finelydivided lead, filling completely the vessel with acetic acid, closingthe vessel and forcing air into the vessel up to a certain overpressurewhereby the converting of the acetic acid into lead-acetateV takes lace.p 2. Process for manufacturing lead-acetate consisting 1n feeding avessel with finely divided lead, filling completely the vessel'withlacetic acid, closing the vessel and forcing air into the vessel up toan overpressure of about 4 atmospheres, whereby the `converting of theacetic acid into leadacetate takes place.

In witness whereof l have hereunto set my hand in the presence of twowitnesses.

ADOLF WULTZE.

Witnesses HENRY HAsPnn, WOLDEMAB HAUPT.

